单非晶丝磁芯双绕组新型磁传感器理论与实验研究

Theoretical and Experimental Study of a New Magnetic Sensor Using Single Co-Based Amorphous Wire Core and Double-Winding

采用旋转水中淬火纺丝法制备的钴基非晶态合金丝作为磁敏感材料,提出了一种采用单非晶丝磁芯双绕组结构,多谐振荡桥励磁,对弱磁场进行检测的高灵敏度、高线性度新型磁传感器。通过建立敏感磁芯的理想磁滞回线模型并根据电路理论及电磁场理论,推出了传感器的输出信号与待测磁场、振荡桥元件参数、线圈匝数、敏感磁芯的磁参数及磁芯几何参数的关系,通过实验证实了在传感器线性检测区域内理论结果的正确性,从而为优化传感器性能提供了理论依据。文中给出了研制的磁传感器对外磁场的检测结果。

Using Co-based amorphous wire with nominal composition Co70. 4 Fe4. 6 Si15 B10 fabricated by in-rotating-water quenching spinning techniques as the sensing materials, a new type of magnetic sensor, with high sensitivity and high linearity, was proposed . The magnetic sensor adopted multivibrator inclduing single amorphous wire core and double-winding as a basic circuit. The relations among output voltage signal of the sensor , circuit component parameters, the number of turns , the magnetic parameter and size parameter of the sensing core were derived based on building up ideal hysteresis loop model of the amorphous core ,as well as the circuit theory and the electromagnetic theory. The theoretic results were proved to be correct under linear range of the sensor by experiment, and those research results provides scientific foundations to optimize the sensor＇s characteristics. At last ,the testing results for the sensor to measure external magnetic field provided by Helmholtz coil were given.